Apparatus

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sensors Mode-S transponder

71E238

ICAO 24-bit transponder address · allocated to Korea, South

Hex
71E238
Octal
34361070
Decimal
7,463,480
Country
KR
Broadcasting now · callsign HLC238 · 850 ft
Flights observed
274
Distinct callsigns
1
Country
KR
Last broadcast
1h ago

Current position

71E238 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 71E238 falls within the block assigned to Korea, South (KR) by ICAO Annex 10, Volume III. Every aircraft registered in Korea, South receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 1 distinct

Callsign Airline Flights Last seen
HLC238 - 269 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 HLC238 - Jul 18, 07:00 UTCJul 18, 07:20 UTC20m
2026-07-17 HLC238 - Jul 17, 10:00 UTCJul 17, 10:20 UTC20m
2026-07-17 HLC238 - Jul 17, 08:04 UTCJul 17, 09:20 UTC1h 15m
2026-07-17 HLC238 - Jul 17, 06:40 UTCJul 17, 07:25 UTC45m
2026-07-17 HLC238 - Jul 17, 05:50 UTCJul 17, 06:05 UTC15m
2026-07-17 HLC238 - Jul 17, 03:34 UTCJul 17, 04:10 UTC35m
2026-07-17 HLC238 - Jul 17, 00:35 UTCJul 17, 02:34 UTC2h 0m
2026-07-16 HLC238 - Jul 16, 09:20 UTCJul 16, 09:55 UTC35m
2026-07-16 HLC238 - Jul 16, 07:40 UTCJul 16, 08:30 UTC50m
2026-07-16 HLC238 - Jul 16, 04:20 UTCJul 16, 05:10 UTC50m
2026-07-12 HLC238 - Jul 12, 08:40 UTCJul 12, 08:50 UTC10m
2026-07-12 HLC238 - Jul 12, 05:25 UTCJul 12, 06:05 UTC40m
2026-07-12 HLC238 - Jul 12, 03:40 UTCJul 12, 04:20 UTC40m
2026-07-11 HLC238 - Jul 11, 23:10 UTCJul 11, 23:50 UTC40m
2026-07-11 HLC238 - Jul 11, 06:45 UTCJul 11, 07:30 UTC45m
2026-07-11 HLC238 - Jul 11, 05:20 UTCJul 11, 05:55 UTC35m
2026-07-11 HLC238 - Jul 11, 03:50 UTCJul 11, 04:30 UTC40m
2026-07-11 HLC238 - Jul 11, 02:10 UTCJul 11, 03:01 UTC50m
2026-07-07 HLC238 - Jul 7, 07:15 UTCJul 7, 08:35 UTC1h 20m
2026-07-07 HLC238 - Jul 7, 05:20 UTCJul 7, 06:30 UTC1h 10m
2026-07-04 - - Jul 4, 09:15 UTCJul 4, 09:45 UTC30m
2026-07-04 HLC238 - Jul 4, 06:00 UTCJul 4, 06:40 UTC40m
2026-07-04 HLC238 - Jul 4, 02:50 UTCJul 4, 04:15 UTC1h 25m
2026-07-03 HLC238 - Jul 3, 23:40 UTCJul 4, 00:30 UTC50m
2026-07-03 HLC238 - Jul 3, 10:05 UTCJul 3, 10:15 UTC10m
2026-07-03 HLC238 - Jul 3, 08:45 UTCJul 3, 09:10 UTC25m
2026-07-03 HLC238 - Jul 3, 07:20 UTCJul 3, 08:05 UTC45m
2026-07-03 HLC238 - Jul 3, 05:10 UTCJul 3, 05:20 UTC10m
2026-07-03 HLC238 - Jul 3, 03:40 UTCJul 3, 04:25 UTC45m
2026-07-02 HLC238 - Jul 2, 07:30 UTCJul 2, 08:20 UTC50m
2026-07-02 HLC238 - Jul 2, 01:40 UTCJul 2, 01:50 UTC10m
2026-07-01 HLC238 - Jul 1, 08:40 UTCJul 1, 09:45 UTC1h 5m
2026-07-01 HLC238 - Jul 1, 05:10 UTCJul 1, 05:50 UTC40m
2026-07-01 HLC238 - Jul 1, 01:25 UTCJul 1, 01:45 UTC20m
2026-07-01 HLC238 - Jul 1, 00:00 UTCJul 1, 00:45 UTC45m
2026-06-30 HLC238 - Jun 30, 07:35 UTCJun 30, 08:35 UTC1h 0m
2026-06-30 HLC238 - Jun 30, 03:20 UTCJun 30, 03:55 UTC35m
2026-06-29 HLC238 - Jun 29, 08:50 UTCJun 29, 09:10 UTC20m
2026-06-29 HLC238 - Jun 29, 05:50 UTCJun 29, 06:40 UTC50m
2026-06-29 HLC238 - Jun 29, 04:14 UTCJun 29, 05:00 UTC45m
2026-06-29 HLC238 - Jun 29, 02:50 UTCJun 29, 03:34 UTC45m
2026-06-28 HLC238 - Jun 28, 07:05 UTCJun 28, 07:50 UTC45m
2026-06-28 HLC238 - Jun 28, 05:20 UTCJun 28, 05:49 UTC30m
2026-06-28 HLC238 - Jun 28, 03:25 UTCJun 28, 04:10 UTC45m
2026-06-28 HLC238 - Jun 28, 00:55 UTCJun 28, 01:29 UTC35m
2026-06-27 HLC238 - Jun 27, 09:24 UTCJun 27, 10:19 UTC55m
2026-06-27 HLC238 - Jun 27, 07:30 UTCJun 27, 07:49 UTC20m
2026-06-27 HLC238 - Jun 27, 04:05 UTCJun 27, 04:59 UTC55m
2026-06-27 HLC238 - Jun 27, 01:54 UTCJun 27, 02:29 UTC35m
2026-06-26 HLC238 - Jun 26, 08:24 UTCJun 26, 09:10 UTC45m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Mode-S 71E238 frequently asked

What is Mode-S code 71E238?
71E238 is an ICAO 24-bit transponder address. Allocated to Korea, South.
Where is Mode-S 71E238 registered?
Mode-S code 71E238 is allocated to Korea, South (KR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 71E238 broadcasting right now?
Yes. Mode-S 71E238 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71E238, octal 34361070, decimal 7,463,480.
What flights does 71E238 operate?
Mode-S 71E238 has broadcast 1 distinct callsign, including HLC238.